#include <stdio.h>

int main()
{
    int a,i,m;
    printf("There are following perfect numbers smaller than 1000:\n");
    for(a = 1;a < 1000;a++)
    {
        for(m = 0,i = 1;i <= a / 2;i++)
        if(!(a % i))
        m += i;
        if(m == a)
        printf(" %4d",a);
    }
    printf("\n");
}